Add version variable to core; update road map.

doc/user_guide/docs/roadmap.md

@@ -60,8 +60,13 @@ usage and opportunities for expanding adoption in relevant areas.
         - ✓ Option to clean up sources & LL on success
     - ✓ Submission report
     - ✓ Deleting resources
+    - ✓ Allow updating a file's metadata if it's only present in the archive
     - ❏ Prevent modification of system properties
-    - ⚒ Allow updating a file's metadata if it's only present in the archive
+    - ❏ Protect some properties when updating resource
+    - ❏ Define list of system-managed properties (user-provided data ignored)
+    - ❏ Protect some properties when updating resource
+        - Do not update: `content_model`, `submitted`, `submitted_by`
+        - Do not delete existing: `sub_id`
 - ✓ Proper collection handling
     - ✓ Dedicated template
     - ✓ Link to markdown doc for presentation page

src/core.lua

@@ -7,6 +7,8 @@ local term = require "volksdata.term"
 local nsm = require "volksdata.namespace"
 
 
+local VERSION = "1.0a2"
+
 -- Read only module properties.
 local PROTECTED = {
     store = true,